Methods for detecting and responding to freezing coils in...

Refrigeration – Processes – Defrosting or frost inhibiting

Reexamination Certificate

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C062S129000, C062S151000, C062S155000, C062S140000, C062S180000, C062S226000, C062S234000

Reexamination Certificate

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07836707

ABSTRACT:
A method to detect and respond to a coil condition in an HVAC system. The method includes calculating an initial airflow restriction value and a current airflow restriction value, which are compared. If the current airflow restriction value is greater than a first sum including the initial airflow restriction value and a first restriction factor, then a coil condition is preliminarily determined to be freezing and cooling in the HVAC system is stopped.

REFERENCES:
patent: 4831833 (1989-05-01), Duenes et al.
patent: 5170635 (1992-12-01), Wruck et al.
patent: 5463875 (1995-11-01), Shavit
patent: 2006/0130497 (2006-06-01), Kang et al.
“Establishing Cooling Requirements: Air Flow vs Pressure” www.comairrotron.com/engineering—notes—02.asp. Dated May 15, 2004.

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